small fix on document about VCS
small fix on document about VCS

apdavison/sumatra,open-research/sumatra,apdavison/sumatra,apdavison/sumatra,apdavison/sumatra,open-research/sumatra,maxalbert/sumatra,open-research/sumatra,maxalbert/sumatra,dpad/sumatra,maxalbert/sumatra,open-research/sumatra,babsey/sumatra,babsey/sumatra,maxalbert/sumatra,dpad/sumatra,babsey/sumatra,dpad/sumatra,apdavison/sumatra,open-research/sumatra,dpad/sumatra,dpad/sumatra,babsey/sumatra,babsey/sumatra,maxalbert/sumatra